Use mvn-quiet.sh in a couple of places it was missed.
Fix mvn warnings.
Provide -q flag to git clean to prevent it reporting all of the files it
deletes.
Change-Id: I77ec2265bf35f64ab1ac76b0a253e67c5f97eccd
Reviewed-on: http://gerrit.cloudera.org:8080/1804
Reviewed-by: Tim Armstrong <tarmstrong@cloudera.com>
Tested-by: Internal Jenkins